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Money. "The Economics of International Monies" by G. Dwyer & J. Lothian. Abstract: "The authors summarize the history of international monies, from the gold solidus introduced in the fourth century to the present. They identify four common characteristics of these currencies: high unitary value; relatively low inflation rates; issuance by major economic and trading powers; and spontaneous, as opposed to planned, adoption .. Recent theories' common implication of multiple equilibria supports the importance of spontaneous adoption as developed by Menger and Hayek."